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crypto: add basic functionality for parsing SSE-C headers (#6148)
This commit adds basic support for SSE-C / SSE-C copy. This includes functions for determining whether SSE-C is requested by the S3 client and functions for parsing such HTTP headers. All S3 SSE-C parsing errors are exported such that callers can pattern-match to forward the correct error to S3 clients. Further the SSE-C related internal metadata entry-keys are added by this commit.
This commit is contained in:
Andreas Auernhammer
Dee Koder
parent
3ec4738955
commit
758a80e39b
@ -27,6 +27,26 @@ var (
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// ErrInvalidEncryptionMethod indicates that the specified SSE encryption method
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// is not supported.
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ErrInvalidEncryptionMethod = errors.New("The encryption method is not supported")
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// ErrInvalidCustomerAlgorithm indicates that the specified SSE-C algorithm
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// is not supported.
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ErrInvalidCustomerAlgorithm = errors.New("The SSE-C algorithm is not supported")
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// ErrMissingCustomerKey indicates that the HTTP headers contains no SSE-C client key.
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ErrMissingCustomerKey = errors.New("The SSE-C request is missing the customer key")
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// ErrMissingCustomerKeyMD5 indicates that the HTTP headers contains no SSE-C client key
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// MD5 checksum.
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ErrMissingCustomerKeyMD5 = errors.New("The SSE-C request is missing the customer key MD5")
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// ErrInvalidCustomerKey indicates that the SSE-C client key is not valid - e.g. not a
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// base64-encoded string or not 256 bits long.
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ErrInvalidCustomerKey = errors.New("The SSE-C client key is invalid")
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// ErrCustomerKeyMD5Mismatch indicates that the SSE-C key MD5 does not match the
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// computed MD5 sum. This means that the client provided either the wrong key for
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// a certain MD5 checksum or the wrong MD5 for a certain key.
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ErrCustomerKeyMD5Mismatch = errors.New("The provided SSE-C key MD5 does not match the computed MD5 of the SSE-C key")
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)
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var (
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@ -15,12 +15,43 @@
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package crypto
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import (
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"bytes"
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"crypto/md5"
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"encoding/base64"
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"net/http"
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)
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// SSEHeader is the general AWS SSE HTTP header key.
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const SSEHeader = "X-Amz-Server-Side-Encryption"
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const (
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// SSECAlgorithm is the HTTP header key referencing
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// the SSE-C algorithm.
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SSECAlgorithm = SSEHeader + "-Customer-Algorithm"
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// SSECKey is the HTTP header key referencing the
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// SSE-C client-provided key..
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SSECKey = SSEHeader + "-Customer-Key"
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// SSECKeyMD5 is the HTTP header key referencing
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// the MD5 sum of the client-provided key.
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SSECKeyMD5 = SSEHeader + "-Customer-Key-Md5"
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)
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const (
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// SSECopyAlgorithm is the HTTP header key referencing
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// the SSE-C algorithm for SSE-C copy requests.
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SSECopyAlgorithm = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm"
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// SSECopyKey is the HTTP header key referencing the SSE-C
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// client-provided key for SSE-C copy requests.
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SSECopyKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
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// SSECopyKeyMD5 is the HTTP header key referencing the
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// MD5 sum of the client key for SSE-C copy requests.
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SSECopyKeyMD5 = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5"
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)
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// SSEAlgorithmAES256 is the only supported value for the SSE-S3 or SSE-C algorithm header.
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// For SSE-S3 see: https://docs.aws.amazon.com/AmazonS3/latest/dev/SSEUsingRESTAPI.html
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// For SSE-C see: https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
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@ -47,3 +78,99 @@ func (s3) Parse(h http.Header) (err error) {
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}
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return
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}
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var (
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// SSEC represents AWS SSE-C. It provides functionality to handle
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// SSE-C requests.
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SSEC = ssec{}
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// SSECopy represents AWS SSE-C for copy requests. It provides
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// functionality to handle SSE-C copy requests.
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SSECopy = ssecCopy{}
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)
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type ssec struct{}
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type ssecCopy struct{}
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// IsRequested returns true if the HTTP headers contains
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// at least one SSE-C header. SSE-C copy headers are ignored.
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func (ssec) IsRequested(h http.Header) bool {
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if _, ok := h[SSECAlgorithm]; ok {
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return true
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}
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if _, ok := h[SSECKey]; ok {
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return true
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}
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if _, ok := h[SSECKeyMD5]; ok {
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return true
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}
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return false
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}
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// IsRequested returns true if the HTTP headers contains
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// at least one SSE-C copy header. Regular SSE-C headers
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// are ignored.
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func (ssecCopy) IsRequested(h http.Header) bool {
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if _, ok := h[SSECopyAlgorithm]; ok {
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return true
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}
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if _, ok := h[SSECopyKey]; ok {
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return true
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}
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if _, ok := h[SSECopyKeyMD5]; ok {
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return true
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}
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return false
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}
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// Parse parses the SSE-C headers and returns the SSE-C client key
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// on success. SSE-C copy headers are ignored.
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func (ssec) Parse(h http.Header) (key [32]byte, err error) {
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defer h.Del(SSECKey) // remove SSE-C key from headers after parsing
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if h.Get(SSECAlgorithm) != SSEAlgorithmAES256 {
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return key, ErrInvalidCustomerAlgorithm
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}
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if h.Get(SSECKey) == "" {
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return key, ErrMissingCustomerKey
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}
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if h.Get(SSECKeyMD5) == "" {
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return key, ErrMissingCustomerKeyMD5
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}
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clientKey, err := base64.StdEncoding.DecodeString(h.Get(SSECKey))
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if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
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return key, ErrInvalidCustomerKey
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}
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keyMD5, err := base64.StdEncoding.DecodeString(h.Get(SSECKeyMD5))
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if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {
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return key, ErrCustomerKeyMD5Mismatch
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}
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copy(key[:], clientKey)
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return key, nil
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}
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// Parse parses the SSE-C copy headers and returns the SSE-C client key
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// on success. Regular SSE-C headers are ignored.
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func (ssecCopy) Parse(h http.Header) (key [32]byte, err error) {
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defer h.Del(SSECopyKey) // remove SSE-C copy key of source object from headers after parsing
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if h.Get(SSECopyAlgorithm) != SSEAlgorithmAES256 {
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return key, ErrInvalidCustomerAlgorithm
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}
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if h.Get(SSECopyKey) == "" {
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return key, ErrMissingCustomerKey
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}
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if h.Get(SSECopyKeyMD5) == "" {
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return key, ErrMissingCustomerKeyMD5
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}
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clientKey, err := base64.StdEncoding.DecodeString(h.Get(SSECopyKey))
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if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
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return key, ErrInvalidCustomerKey
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}
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keyMD5, err := base64.StdEncoding.DecodeString(h.Get(SSECopyKeyMD5))
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if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {
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return key, ErrCustomerKeyMD5Mismatch
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}
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copy(key[:], clientKey)
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return key, nil
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}
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@ -19,7 +19,7 @@ import (
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"testing"
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)
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var isRequestedTests = []struct {
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var s3IsRequestedTests = []struct {
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Header http.Header
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Expected bool
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}{
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@ -30,14 +30,14 @@ var isRequestedTests = []struct {
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}
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func TestS3IsRequested(t *testing.T) {
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for i, test := range isRequestedTests {
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for i, test := range s3IsRequestedTests {
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if got := S3.IsRequested(test.Header); got != test.Expected {
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t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
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}
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}
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}
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var parseTests = []struct {
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var s3ParseTests = []struct {
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Header http.Header
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ExpectedErr error
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}{
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@ -48,9 +48,257 @@ var parseTests = []struct {
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}
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func TestS3Parse(t *testing.T) {
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for i, test := range parseTests {
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for i, test := range s3ParseTests {
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if err := S3.Parse(test.Header); err != test.ExpectedErr {
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t.Errorf("Test %d: Wanted '%v' but got '%v'", i, test.ExpectedErr, err)
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}
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}
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}
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var ssecIsRequestedTests = []struct {
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Header http.Header
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Expected bool
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}{
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{Header: http.Header{}, Expected: false}, // 0
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{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true}, // 1
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{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
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{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true}, // 3
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{""},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{""},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{""},
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},
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Expected: true,
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}, // 4
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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Expected: true,
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}, // 5
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{
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Header: http.Header{
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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Expected: false,
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}, // 6
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}
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func TestSSECIsRequested(t *testing.T) {
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for i, test := range ssecIsRequestedTests {
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if got := SSEC.IsRequested(test.Header); got != test.Expected {
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t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
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}
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}
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}
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var ssecCopyIsRequestedTests = []struct {
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Header http.Header
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Expected bool
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}{
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{Header: http.Header{}, Expected: false}, // 0
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{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true}, // 1
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{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
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{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true}, // 3
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{
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Header: http.Header{
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{""},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{""},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{""},
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},
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Expected: true,
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}, // 4
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{
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Header: http.Header{
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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Expected: true,
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}, // 5
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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Expected: false,
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}, // 6
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}
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func TestSSECopyIsRequested(t *testing.T) {
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for i, test := range ssecCopyIsRequestedTests {
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if got := SSECopy.IsRequested(test.Header); got != test.Expected {
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t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
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}
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}
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}
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var ssecParseTests = []struct {
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Header http.Header
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ExpectedErr error
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}{
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: nil, // 0
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{""}, // no client key
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: ErrMissingCustomerKey, // 2
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: ErrInvalidCustomerKey, // 3
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{""}, // no key MD5
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},
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ExpectedErr: ErrMissingCustomerKeyMD5, // 4
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
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},
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{
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Header: http.Header{
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"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
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},
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ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
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},
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}
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func TestSSECParse(t *testing.T) {
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var zeroKey [32]byte
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for i, test := range ssecParseTests {
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key, err := SSEC.Parse(test.Header)
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if err != test.ExpectedErr {
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t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
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}
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if err != nil && key != zeroKey {
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t.Errorf("Test %d: parsing failed and client key is not zero key", i)
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}
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if err == nil && key == zeroKey {
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t.Errorf("Test %d: parsed client key is zero key", i)
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}
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if _, ok := test.Header[SSECKey]; ok {
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t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
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}
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}
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}
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var ssecCopyParseTests = []struct {
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Header http.Header
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ExpectedErr error
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}{
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{
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Header: http.Header{
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
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},
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ExpectedErr: nil, // 0
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},
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{
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Header: http.Header{
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"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
|
||||
},
|
||||
ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
|
||||
},
|
||||
{
|
||||
Header: http.Header{
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{""}, // no client key
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
|
||||
},
|
||||
ExpectedErr: ErrMissingCustomerKey, // 2
|
||||
},
|
||||
{
|
||||
Header: http.Header{
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
|
||||
},
|
||||
ExpectedErr: ErrInvalidCustomerKey, // 3
|
||||
},
|
||||
{
|
||||
Header: http.Header{
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{""}, // no key MD5
|
||||
},
|
||||
ExpectedErr: ErrMissingCustomerKeyMD5, // 4
|
||||
},
|
||||
{
|
||||
Header: http.Header{
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="},
|
||||
},
|
||||
ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
|
||||
},
|
||||
{
|
||||
Header: http.Header{
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
|
||||
"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
|
||||
},
|
||||
ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
|
||||
},
|
||||
}
|
||||
|
||||
func TestSSECopyParse(t *testing.T) {
|
||||
var zeroKey [32]byte
|
||||
for i, test := range ssecCopyParseTests {
|
||||
key, err := SSECopy.Parse(test.Header)
|
||||
if err != test.ExpectedErr {
|
||||
t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
|
||||
}
|
||||
|
||||
if err != nil && key != zeroKey {
|
||||
t.Errorf("Test %d: parsing failed and client key is not zero key", i)
|
||||
}
|
||||
if err == nil && key == zeroKey {
|
||||
t.Errorf("Test %d: parsed client key is zero key", i)
|
||||
}
|
||||
if _, ok := test.Header[SSECKey]; ok {
|
||||
t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -25,11 +25,24 @@ import (
|
||||
)
|
||||
|
||||
const (
|
||||
// SSEIV is the metadata key referencing the random initialization
|
||||
// vector (IV) used for SSE-S3 and SSE-C key derivation.
|
||||
SSEIV = "X-Minio-Internal-Server-Side-Encryption-Iv"
|
||||
|
||||
// SSESealAlgorithm is the metadata key referencing the algorithm
|
||||
// used by SSE-C and SSE-S3 to encrypt the object.
|
||||
SSESealAlgorithm = "X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm"
|
||||
|
||||
// SSECSealKey is the metadata key referencing the sealed object-key for SSE-C.
|
||||
SSECSealKey = "X-Minio-Internal-Server-Side-Encryption-Sealed-Key"
|
||||
|
||||
// S3SealedKey is the metadata key referencing the sealed object-key for SSE-S3.
|
||||
S3SealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key"
|
||||
|
||||
// S3KMSKeyID is the metadata key referencing the KMS key-id used to
|
||||
// generate/decrypt the S3-KMS-Sealed-Key. It is only used for SSE-S3 + KMS.
|
||||
S3KMSKeyID = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id"
|
||||
|
||||
// S3KMSSealedKey is the metadata key referencing the encrypted key generated
|
||||
// by KMS. It is only used for SSE-S3 + KMS.
|
||||
S3KMSSealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key"
|
||||
@ -57,6 +70,14 @@ func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
|
||||
return r
|
||||
}
|
||||
|
||||
// EncryptMultiPart encrypts an io.Reader which must be the body of
|
||||
// multi-part PUT request. It derives an unique encryption key from
|
||||
// the partID and the object key.
|
||||
func EncryptMultiPart(r io.Reader, partID int, key ObjectKey) io.Reader {
|
||||
partKey := key.DerivePartKey(uint32(partID))
|
||||
return EncryptSinglePart(r, ObjectKey(partKey))
|
||||
}
|
||||
|
||||
// DecryptSinglePart decrypts an io.Writer which must an object
|
||||
// uploaded with the single-part PUT API. The offset and length
|
||||
// specify the requested range.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user